Thermally modified wood: Fracture toughness in mode II examined using optical technique

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Thermally modified wood: Fracture toughness in mode II examined using optical technique

Popis výsledku v původním jazyce

Thermally modified timber (TMT) has been used as an eco-friendly alternative to tropical species that has increased hygrophobicity. Nevertheless, thermal modification influences a wide range of wood properties and brings undesired side effects such as a reduction of mechanical properties. Therefore, this paper aims to evaluate the fracture properties of TMT hypothesized to be influenced by thermal modification. Within the study, we have examined beech wood subjected to three treatments: (i) no treatment; (ii) treated at 180 oC and (iii) treated at 200 oC. The treatment was carried out over 7 hours in a thermal chamber and after the treatment, all samples were conditioned at same conditions before measurement. A 162mm artificial crack was introduced to each sample following the requirements of the end-notched flexure test in shear - mode II. The samples were tested in a three-point bending set-up that provided a global mechanical response (load-displacement curve). Resistance curves were calculated based the load displacement curves. Physical measurement was accompanied with an optical technique based on digital image correlation (DIC) providing full-field displacements and strains. The results revealed that modification temperature substantially decreases the strength in compression parallel to the fiber and energy release rate (GII) in mode II parallel to the fiber. The higher the modification temperature, the larger decrease in fracture properties.

Název v anglickém jazyce

Thermally modified wood: Fracture toughness in mode II examined using optical technique

Popis výsledku anglicky

Thermally modified timber (TMT) has been used as an eco-friendly alternative to tropical species that has increased hygrophobicity. Nevertheless, thermal modification influences a wide range of wood properties and brings undesired side effects such as a reduction of mechanical properties. Therefore, this paper aims to evaluate the fracture properties of TMT hypothesized to be influenced by thermal modification. Within the study, we have examined beech wood subjected to three treatments: (i) no treatment; (ii) treated at 180 oC and (iii) treated at 200 oC. The treatment was carried out over 7 hours in a thermal chamber and after the treatment, all samples were conditioned at same conditions before measurement. A 162mm artificial crack was introduced to each sample following the requirements of the end-notched flexure test in shear - mode II. The samples were tested in a three-point bending set-up that provided a global mechanical response (load-displacement curve). Resistance curves were calculated based the load displacement curves. Physical measurement was accompanied with an optical technique based on digital image correlation (DIC) providing full-field displacements and strains. The results revealed that modification temperature substantially decreases the strength in compression parallel to the fiber and energy release rate (GII) in mode II parallel to the fiber. The higher the modification temperature, the larger decrease in fracture properties.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20502 - Paper and wood

Projekt

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Návaznosti

O - Projekt operacniho programu

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

World Conference on Timber Engineering: Proceedings

ISBN

979-11-6019-235-3

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

6

Strana od-do

"Nestrankovano"

Název nakladatele

National Institute of Forest Science

Místo vydání

Soul

Místo konání akce

Soul

Datum konání akce

20. 8. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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